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SECURITIES - Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Amortized Cost	$ 3,183	$ 2,469
Unrecognized Gains	11	32
Unrecognized Losses	0	0
Estimated Fair Value	3,194	2,501
Amortized Cost
Within one year	1,523
After one, but within five years	860
After five, but within ten years	800
After ten years	0
Total	3,183
Securities held to maturity	3,183	2,469
Fair Value
Within one year	1,532
After one, but within five years	862
After five, but within ten years	800
After ten years	0
Total	3,194
Securities held to maturity	3,194	2,501
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Amortized Cost	1,300	326
Unrecognized Gains	0	0
Unrecognized Losses	0	0
Estimated Fair Value	1,300	326
Amortized Cost
Securities held to maturity	1,300	326
Fair Value
Securities held to maturity	1,300	326
Time deposits with other financial institutions
Amortized cost and estimated fair value of securities held to maturity [Abstract]
Amortized Cost	1,883	2,143
Unrecognized Gains	11	32
Unrecognized Losses	0	0
Estimated Fair Value	1,894	2,175
Amortized Cost
Securities held to maturity	1,883	2,143
Fair Value
Securities held to maturity	1,894	$ 2,175
Mortgage-backed securities, residential
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	0
SBA loan pools
Amortized Cost
Without single maturity date	0
Fair Value
Without single maturity date	$ 0

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